# Posts by Chris

Total # Posts: 2,711

**Chemistry**

So is B correct, can someone explain

**Math**

Hi Bob - I have 4 possible answers and cannot arrive at any of them by the above. My choices are (a)634mph (b)1038mph (c)761mph (d)113mph

**Math**

The radius of Earth is 3,959 miles. A spacecraft orbits 6 miles above the surface of Earth. The spacecraft completes 220° of a revolution around Earth in one day. What is the average speed of the spacecraft?

**physics**

A 10.4 kg object oscillates at the end of a vertical spring that has a spring constant of 17500 N/m. The effect of air resistance is represented by the damping coefficient b = 3.00 N¡¤s/m.

**Chemistry**

A sample of hydrogen is collected over water at a total pressure of 648 mm Hg at 22 oC. The vapor pressure of water at 22 oC is 19.8 mm Hg. The partial pressure of the hydrogen is __________.

**Social studies**

Thank you Ms. Sue Anyone else have info to add to Ms. Sue's answer.

**Social studies**

Brief synopsis on the cause, effect and result Of the attack on Pearl Harbor. Six and one half Pages already typed and on cardboard made A flag, have pictures, just need alittle help In summarizing some facts you may have with The facts I have for the cardboard display Board. ...

**Geometry**

A museum was designed without windows, but a truncated cylindrical skylight lightens the building. In the development of this, the architect has areas where the angles formed at junctures are vertical angles. If a pair of vertical angles measures 5x - 54 and 3x -24, find the ...

**Algebra**

Tina's change of $1.35 consisted of quarters and dimes only and she received twice as many dimes as quarters. How many dimes were there?

**Algebra**

At its grand opening, the gutherie market distributed two different types of souvenirs. One type costs 20 centseach, and the other type costs 25 cents each. One thousand souvenirs were distributed in all. If the cost of these souvenirs was $220, how many of each type were ...

**Algebra**

The length of a rectangular playground exceeds twice its width by 25 meters, The perimeter of the playground is 650 meters. Find the demensions of the playground.

**Chemistry**

A sample weighing 3.064 g is a mixture of Fe2O3 (molar mass = 159.69) and Al2O3 (molar mass = 101.96). When heat and a stream of H2 gas is applied to the sample, the Fe2O3 reacts to form metallic Fe and H2O(g). The Al2O3 does not react. If the sample residue weighs 2.407 g, ...

**Physics**

A rocket of mass 1.0x10^3kg is being fired to a height of 5.0 x 10^3 m. The rocket engine shuts off when the rocket reaches a height of 1.0x10^3m, and the rocket coasts up to 5.0 x 10^3 m. A) What velocity must the rocket have at the 1.0x10^3 m point to enable it to reach 5.0 ...

**Math**

A local animal shelter had four more than six times as many adult cats as kittens. After eight of the kittens were adopted, the shelter had four fewer than eight times as many adult cats as kittens. How many adult cats are at the shelter?

**chemistry**

If a current of 5.0 Amps is passed through the electrolytic cell for .5 hour, how should you calculate the number of grams of bromine produced?

**Chemistry**

I took that answer (0.327 mmol) and divided it by 50ml to get my Molarity. But this does not seem correct. What am I doing wrong?

**Chemistry**

A 50.0 mL sample containing Cd2 and Mn2 was treated with 49.1 mL of 0.0700 M EDTA. Titration of the excess unreacted EDTA required 17.5 mL of 0.0300 M Ca2 . The Cd2 was displaced from EDTA by the addition of an excess of CN–. Titration of the newly freed EDTA required 10....

**english**

Point of View

**College Chemistry**

The specific Heat of gold is 0.128 J/g degrees Celsius. How much heat would be needed to warm 250.0g of gold from 25.0 degrees Celsius to 100.0 degrees Celsius

**Social studies**

What caused the Japanese ( what did the USA do) to attack Pearl Harbor.

**Social studies**

What caused the Japanese ( what did the USA do) to attack Pearl Harbor.

**chemisty 2**

Calculate the molarity (M) of a solution if you have 0.34 mol of NaOH in 19 ml of water

**Math**

2(2x+7)+(3x-5)=37

**Math**

2(2+7)+(6x-5)=37

**Math**

2(2+7)+(6x-5)=37

**math**

it has a picture with it but it wont past to the page

**math**

Write a number sentence for the model. Let one white tile equal +1 and one black tile equal –1. A. –14 – (–6) = –8 B. 14 – 6 = 8 C. –14 – 6 = –8 D. –14 – (–6) = 8 i put d but it was rong

**Math**

Radius of earth 3,959 miles Space shuttle orbits 200 miles above earths Surface Space shuttle completes 220 degrees of a Revolution around earth in one day What is the average speed of the space Shuttle

**Math**

Radius of earth 3,959 miles Space shuttle orbits 200 miles above earths Surface Space shuttle completes 220 degrees of a Revolution around earth in one day What is the average speed of the space Shuttle

**Algebra**

The cost of 5 similar cameras and 3 similar video cameras is $3,213. Each video camera costs 4 times as much as each digital camera. John buys a digital camera and a video camera. How much does he pay?

**CHEMISTRY**

NH4OH + H2O =

**physics**

what is a satellite's altitude above the surface of the earth if earth's mass is 5.98*10^24 kg and its radius is 6380 km?

**Chemistry**

How many moles of KBr are present in 120mL of a 0.290M solution?

**Chemistry**

How many milliliters of 7.00M HCl solution are needed to obtain 0.200mol of HCl?

**Physics**

What does the tire preseeure reading in your vehicle signify? Is it an absolute pressure?

**Chemistry**

Calculate the concentrations of all species in a 1.41 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8. Na^+ = 2.82M SO3^2- = 1.40M HSO3^- = 0.00047M H2SO3 = OH^- = H^+ = I have been ...

**Chemistry**

Calculate the concentrations of all species in a 1.41 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8. Na^+ = 2.82M SO3^2- = 1.40M HSO3^- = 0.00047M H2SO3 = OH^- = H^+ = I have been ...

**Physics**

Two boys of the same mass, 45 kg, are on a playground merry-go-round that has a diameter of 4.0 meters. Both boys are at the very edge of the ride. One boy stands with the coefficient of friction between his shoes and eh ride being .45 whereas the other is on his knees with a ...

**Elementary Math**

-0.1<=y<=0.1 <= means less than or equal to So if I break the statement up is y <= -0.1 y>=0.1 Correct? Please help I'm confused.

**Trigonometry**

If a stake is placed in the ground and is 20cm. high and casts a shadow 12.5 cm. long, what time is it? (The sun rises at 6 a.m. and is overhead at noon.)

**Math**

Which statement illustrates the additive identity? a)3+0=3 b)3-3=0 c)3*0=0 d)3*1=3

**Chemistry**

Calculate the pH of 7.2 × 10-8 M HCl. Report your answer to the hundredths place. Next, What fraction of the total H in this solution is from the HCl? Report your answer to the hundredths place. I apologize for the re-post, but I felt the previous one was labeled ...

**Analytical**

I apologize, I saw my mistake, and used HCL (7.2E-8)/(Total) and got: 51.245% This answer is still wrong, so now I am thoroughly confused.

**Analytical**

Thank you very much for the reply. I was able to solve for X (X = 7.03E-8), which I added to that of HCl (Total = 1.405E-7) and was able to obtain the pH (6.85, assume this answer is deemed correct). Here is my problem: I took the (H^+) from HCL (X?) and divided it by the (...

**Analytical**

Calculate the pH of 7.2 × 10-8 M HCl. Report your answer to the hundredths place. Next, What fraction of the total H in this solution is from the HCl? Report your answer to the hundredths place.

**algebra**

Your salary after a 3% salary increase if your salary before the increase was S, what is the algebric expression?

**Chemistry**

How to do significant values in Chemistry? I am totally stuck; I have no idea what to do? My teacher gave me C due to the significant value error. Please help

**math**

Many thanks!!!

**math**

an urn contains 3 blue chips and 7 red chips. sequentially draw 3 chips without replacement. what is the probability that all drawn chips will not be the same color?

**statistics**

an urn contains 3 blue chips and 7 red chips. sequentially draw 3 chips without replacement. what is the probability that all drawn chips will not be the same color?

**Algebra 1**

-2 - radical bar 5 over radical bar 10 simplify

**Algebra 1**

N/5-9=1/5

**math**

i mande 440 at a yard sell in 10 20 i need to have 5 more 10 than 20

**algebra 2**

y varies directly with x. When y = 20, x = 50. Find x when y = 36.

**Math Stats**

Chris is shopping for CDs and decides to purchase 3 movie soundtracks. The store has 9 different movie sountracks in stock. How many different selections of movie sountracks are possible?

**math**

1/3 + 5/6 = 7/6 7/6 + 3/8 = 37/24 37/24 = 1 13/24 or approx 1.5417

**health**

2. ________ in the pancreatic islets secrete the hormone insulin in response to a high concentration of glucose in the blood. A. Beta cells B. Alpha cells C. Gamma cells D. Sigma cells i put b but it said it was wrong

**Physics**

. The cheetah is the fastest running animal in the world. Cheetahs can accelerate to a speed of 20 m/s in 2.5 an can continue to accelerate to reach a stop speed of 29 m/s. Assume the acceleration is constant until the stop speed is reached and is zero thereafter. (a) Express ...

**math**

Ling bought 5 dishes and 9 glasses for $25.50. Each glass cost 50¢ cents more than each dish. How much did Ling spend the glasses

**trig**

I think you mean find all angles theta between 0 and 2pi.

**math**

What is 77 percent round to nearest tenth of a degcree

**writing**

Can someone check my answers for me? True or False... 1. TRUE you should use a comma before the word “and.” 2. FALSE The following is a sentence fragment: It no longer flies. 3. TRUE In the following sentence, the ()'d word is used correctly: The (Jones’) ...

**Chemistry**

prepare some 0.1 HCl by diluting the appropriate volume of stock 'conc' HCl to 1L. The stock acid is 37.4% HCl by weight and has a density of 1.19g/mL . Measure out the required volume with a graduated clyinder

**Physics**

In a stunt for an action movie, the 100 kg actor jumps from a train which is crossing a river bridge. On the river below, the heroine is tied to a raft floating towards a waterfall at 3 m s−1. The raft and heroine have a total mass of 200 kg. a If the hero times his ...

**Math**

What is 3/4 exivalent to? And 0.9 is exivalent to?(:

**Math**

5/6 is exivalent to? 0.85 is exivalent to? 3/4 is exivalent to? And 0.9 is exivalent to?

**science**

what are the number of digits in a measurement that are known with a certain degree of reliability?

**Geometry**

Use the figure below in which ec bisects ad at c. Find the value of x and the measure of the indicated segment.

**Calculus**

An open top box is made by cutting congruent squares from the corners of a 12 inch by 9 inch sheet of cardboard and then folding the sides up to create the box. What are the dimensions of the box which contains the largest volume?

**Algebra 1**

when the cost of a car is multiplied by 0.07 the results is $1710. Find the cost of the car.

**math**

2x^2+18x-20=0

**Math (Geometry)**

What is the midpoint of line BC with B (2,0) and C (-4,6)?

**finance**

A manufacturing company issues a bond with a 100,000 face value and a coupon rate of 7%. If the bond has a life of 30 years, pays annual coupons, and the yield to maturity is 6.8%, what percentage of the bond's price is the present value of the face value?

**chemistry**

How is overall molecular polarity affected by molecular symmetry (specifically shown for alkenes in book)? And what are the consequences for melting and boiling points (in cases of high molecular symmetry versus low molecular symmetry)? I looked for help in the book but it ...

**chemistry**

What is high molecular symmetry and low molecular symmetry and give examples of both please help!!!

**healthcare**

what is the effects of hippa and other regulations on the use of these media for health care communication?

**organic chemisrtry**

What is a stretch (symmetric versus asymmetric)? What is a bend? ionterpreting infrared spectra NEED HELP PLEASE!!!!!!!!!!!!!!

**organic chemisrtry**

What must a molecule possess to be able to absorb radiation in the infra-red region?

**organic chemisrtry**

How do melting points differ for ionic compounds versus those that contain only covalent bonds? Why is this so (explain)?

**organic chemisrtry**

What is high molecular symmetry and low molecular symmetry and give examples of both please

**organic chemistry**

How is overall molecular polarity affected by molecular symmetry (specifically shown for alkenes in book)? And what are the consequences for melting and boiling points (in cases of high molecular symmetry versus low molecular symmetry)?

**Math**

a rare truffle once sold for 13 dollars and 20 cents for a 0.44 ounce can how much would 1 a pound be

**Math**

I am having trouble figuring out this question: My quotient is 1 more than 30/5. My remainder is 2. What division sentence am I?

**health**

Mean intake of seafood in the United States is approximately 3- 1/2 ounces per week, and increased intake is? A. Not advised B. Believed to cause harm C. Not likely to help or harm D. Recommended i think c

**help please**

thank you

**help please**

i think its d

**help please**

Which age groups benefit from physical activity? A. Children B. Middle aged adults C. Older adults D. All of the above

**help please**

By making smart food choices, you can help protect yourself from: A. Accidents B. Bone loss C. Type 2 Diabetes D. Both B and C

**health**

it is c

**health**

What types of food can saturated fats be found in? A. Lima beans B. Whole milk C. Seafood D. Potatoes I got A what do you think

**Algebra**

;p

**Pre algebra math**

How do I do 21 - y, explain

**Math**

HELP?! 1.-9^2 2.(5x^9y)(-2x^-2y^-3) 3.(a^1b^-2) / (a^-2b^4) 4.(7x^-1/y^4)^-2 Scientific notation: 5) .0000745 Decimal Form: 6) 9.3*10^6 Solve: 7.3√-27 8.√(-5a)^2 Simplify: 9.√60x^5y^2 10.√75x^3 / √3x

**Algebra2**

So if the absolute vale equals a negative number there is no solution? Such as: |x^2+2x+1|=-4 So, that has no solution?

**Algebra2**

Making Sure these are right? absolute value: 1.|7x+2|=10 x=1.1 x=1.7 2.|3x-5|=-1 x=1.3 x=2

**Law**

The Jones Act, as the Merchant Marine Act was passed to support a strong national merchant marine, requiring that ships transporting goods on U.S. territorial waters to be built, owned and operated by U.S companies. The majority of the crew also must consist of U.S. citizens. ...

**reading**

the answer is captions

**reading**

is it captions

**reading**

the table of contents is the thing you read that shows you what page to turn to of witch chapter.